Paulin



July 29, 1958 M. PAULlN 2,845,115

MAZOUT BURNERS Filed May 10, 1955 2 Sheets-Sheet 1 INVENTOR MADELEINE PAULIN zwww ATTORNEYS July 29, 1958 M. PAUL! N MAZOUT BURNERS 2 Sheets-Sheet 2 Filed May 10, 1955 INVENTOR MADELEINE PAULIN BY ATTORNEYS United States Patent This invention relates to burners for liquid fuel, such as mazout, of the kind in which a burner assembly is releasably seated on a burner mounting, the mounting having a fuel outlet opening against which a corresponding fuel inlet of the burner is seated.

It will be apparent that riskof loss of fuel and danger to the operator may arise if fuel is allowed to reach the fuel outlet of the mounting when the burner is not in position or not properly in position thereon. Similarly, such risk of loss of fuel and danger to the operator may also arise if the burner can be loosened on the mounting, prior to removal, without the fuel supply being fully closed off.

It is the object of the present invention to provide an improved construction of burner for liquid fuel, wherein the fuel supply cannot be opened, to allow fuel to pass to the burner assembly, unless the burner assembly is securely tightened into position, and conversely wherein the burner assembly cannot be loosened on its mounting without first causing the fuel to be cut off.

According to the present invention, a burner for liquid fuel comprises a burner assembly, a mounting block having a shoulder to form a seat for the burner assembly, a seating surface on said shoulder, said block including a passage for liquid fuel opening at the seating surface of the shoulder, and the burner assembly including a fuel inlet opening at its surface seating against the shoulder and corresponding in position to the passage therein, a spring-loaded fuel control valve disposed in the fuel supply passage and biassed into closed position, an operating member for said valve movably mounted on the block in spaced relationship with respect to the burner assembly at the side thereof remote from the seating surface, and an extensible and retractable device disposed between the burner assembly and the valve operating member so as, when extended to abut against said burner assembly and operating member, to transmit the force of the extensible and retractable device to the valve to open said valve.

An embodiment of burner and mounting in accordance with the invention is hereinafter particularly described with reference to the accompanying drawing, wherein: Fig. l is a central vertical section through the burner and mounting, with the burner shown in partially tightened position; Fig. 2 is a partial vertical section and partial elevation of an operating handle for the burner tightening means.

In these figures the apparatus consists of a mounting block 1 having a shoulder portion 2 upon which is a seating surface 3 against which is pressed, to form a seal, a fuel inlet opening 4 of a burner 5. The seating surface 3 is at the opening of a fuel supply passage 6 leading from a fuel passage 7 past a valve opening 8 which can be closed and opened by movement longitudinally of a valve member 9 biassed into closing position by a compression spring 10. At the upper right-hand part of the block, in Fig. 1, there is a channel running parallel to the plane in which the section is taken and 2,845,115 Patented July 29, 1958 of rectangular cross-section. In this channel there is disposed an extensible and retractable device which abuts at one end against the surface 11 of the burner and at the other end against the arm 12 of a pivoted two-arm lever mounted on the block 1 by a pivot 13, the other arm 14 of said lever abutting against one end of a push rod 15 axially slidable through a packing gland 16 arranged in a bore 17 in the block. The other end of the push rod 15 abuts against an end of the valve member 9. Clockwise rotation of the lever 12, 14 causes the valve member 9 to open the valve opening 8, and viceversa. The extensible and retractable device consists of two nuts 18, 19 each of corresponding rectangular cross-section to that of the channel, in which they are freely slidable. Each nut has a threaded bore, the thread of one nut being right-handed and that of the other nut left-handed. In the threads of these two nuts there is engaged a shaft 20 one end of which is provided with left hand threading and the other with right-hand threading. At its center the shaft 20 has a toothed wheel formation 21 and at each side thereof a smooth circular bushing 22. A handle 23, movable angularly in an opening 23a of the block 1, has bearing portions 24 carried on the bushings 22 and forminga bearing for rotation of the handle about the shaft. In the handle is a slot 25 in which a key element 26 can slide radially with respect to the shaft 20 so as to engage between or be disengaged from between the teeth of the toothed formation 21. In the position shown in Figs. 1 and 2, the

key element 26 is engaged with the toothed formation 21, so that radial movement of the handle will cause corresponding rotation of the shaft 20. To move the key element 26 into and out of engagement with the toothed formation, the key element is carried on the threaded end 27 of a rod 28 which can be freely rotated manually in the handle 23 but which is prevented from axial movement therein by an enlargement 29 seated in a corresponding recess 30 in the handle. The upper end of the rod 28 has a knob 31 for grasping in the hand.

The shaft 20 can thus be moved step by step in either direction at will by twisting the knob 31 appropriately to engage the key element in the toothed formation, moving the handle radially in the appropriate direction, twisting the knob to release the key element, moving the handle back radially, twisting the knob again to re-engage the key element, moving the handle as whole radially in the appropriate direction, and so on.

The operation of the device is as follows:

In the position shown in Fig. 1, the burner is already engaged against its fuel inlet on the shoulder 2, and the extensible and retractable device has already been extended to some extent to cause it to abut at one end against the burner surface 11, and at the other end against the lever arm 12. It will be apparent thatthe force of the valve-closing spring 10 acts through the valve member 9, push rod 15, lever 12, 14, nut 19, shaft 20, and nut 18 to press the burner 5 against its fuel inlet opening. Thus, the fuel supply cannot reach the burner inlet opening unless the burner is already pressed properly into sealing contact therewith.

Starting from the state where there is no burner in position, the extensible and retractable device is shortened, by step by step rotation of the shaft 20, sufficiently to permit the burner to be seated in the position shown. In this condition the valve opening 8 will be closed by the action of the spring 10, and no fuel will be able to reach the fuel outlet. The extensible and retractable device is then extended, by appropriate step by step rotation of the shaft 20, until the nut 18 bears on the burner at all points, and the nut 19 bears on the lever arm 12. Further extension causes the burner to be forced tightly against the shoulder 2 as the lever arm 14 abuts against the push rod 15 and starts to compress the valve spring and open the valve. Still further extension causes the lever arm to abut eventually against a fixed stop 32 on the block -1, thus limiting the opening of the valve but at the same time giving an even more powerful clamping action on the burner, because the-lever 12, 14 is then prevented from further rotation.

In the-action ofreleasing the burner, the extensible and retractable device is retracted and the valve member 9 gradually moves into closed position. When this is reached, the spring 10 no longer acts to rotate the lever 12, 14 anticlockwise, and any further retraction releases the pressure holding the burner against its seating. Thus, the fuel valve cannot be opened without 'having the burner in position on its seating, and the burner cannot be released from its seating without first fully shutting air the fuel supply.

I claim:

1. In a burner assembly for liquid fuel, a burner, .a mounting block having a shoulder to form a seat and a seating surface on said shoulder, said block including a passage for liquid fuel opening at the seating surface of the shoulder, and the burner including a fuel inlet opening at its surface seating against the shoulder and corresponding in position to the passage therein, a springloaded fue'l control valve disposed in the fuel supply passage and 'biassed into closed position, an operating member for said valve movably mounted on the block in spaced relationship with respect to the burner at the side thereof remote from the seating surface, and an extensible and retractable means disposed between the burner and the valve operating member so as, when extended, to abut against said burner to force-said burner against-said seating surface and abut against said operating member, to transmit the force of the extensible and retractable means to the valve to open said valve.

2.111 a burner for liquid fuel, as claimed in claim 1, a stop 'on the mounting block disposed adjacent to the valve operating member so as to be contacted by said operating member as the letter moves when opening the valve, whereby after the tightening device has been extended sufficiently to move the operating member to fully open the valve, further extension of the tightening device effects pressure between the burner and the operating member immobilised by the stop.

3. A burner for liquid fuel, as claimed in claim 1, wherein the extensible and retractable tightening device comprises a rotatable shaft having its opposite end portions threaded, one with a right-hand thread and one with a left hand thread, two nuts correspondingly threaded and engaged to said shaft one on each end portion of the shaft, said nuts abutting axially one against the burner assembly and one against the valve operating member, guide means on the mounting block which allow the nuts to slide axially but which prevent said nuts from rotating when the axle is rotated, and a radial handle on the shaft for rotating said shaft.

4. -A burner for liquid fuel, as claimed in claim 3, including a releasable clutch assembly means on the shaft and acting between the shaft and the radial handle for manual step-by-step rotation of the shaft in either direction-at will.

References Cited in the file of this patent UNITED STATES PATENTS 1,172,480 Napier 'et a1 Feb. 22, 1916 1,533,482 Voorheis Apr. 14, 1925 1,628,895 McKenna May 17, 1927 "2,089,160 Ro'ehm Aug. 3, 1937 2,276,424 Siversen et al Mar. 17, [942 2,485,280 Grace Oct. 18, 1 949 FOREIGN PATENTS 352,816 GreatBritain July 16, 193-1 65,383 Norway Oct. 26, 1942 

